Two-tone test signal method for BTSC calibration
US4811395A · kind A · utility
2Cited by
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4Claims
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Key dates
| Filing date | Oct 8, 1987 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Oct 8, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N17/00
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A two-tone test signal method for calibrating a BTSC monitoring system compensates for errors introduced into the monitoring system by unpredictable high frequency components of noise when testing the low frequency performance characteristics of the monitoring system. The two-tone test signal has a low frequency tone and a lower level high frequency tone which overrides the high frequency component of noise. The two-tone test signal is synthesized according to the BTSC specification to produce a "perfect" left-only signal for both tones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.